Scala无法转换类型Publisher [Publisher [_

Question

我使用Project Reactor流实现在Scala中实现了简单流。

  val iterators: Iterable[Flux[String]] = for (i <- 0 to 4000) yield Flux.interval(5 seconds).map(_.toString)
  val publishers: Flux[Flux[String]] = Flux.just(iterators).flatMapIterable(identity)
  Flux.merge(publishers, 1)

试图编译该代码但出现错误

Error:(156, 8) overloaded method value merge with alternatives:
  [I](prefetch: Int, sources: org.reactivestreams.Publisher[_ <: I]*)reactor.core.scala.publisher.Flux[I] <and>
  [I](sources: org.reactivestreams.Publisher[_ <: I]*)reactor.core.scala.publisher.Flux[I] <and>
  [T](source: org.reactivestreams.Publisher[org.reactivestreams.Publisher[_ <: T]], concurrency: Int)reactor.core.scala.publisher.Flux[T]
 cannot be applied to (reactor.core.scala.publisher.Flux[reactor.core.scala.publisher.Flux[String]], Int)

为什么scala无法转换这些类型？

[Flux.merge(publishers)效果很好，但是当我传递整数参数时，scala编译器会因错误而失败。

Answer 1

如果使用反应堆标量扩展，则以相反的方式应用它。

Flux.merge(1, publishers)